TasteTheRainbow
Thinks He's Good
N is terrible for a few reasons but the biggest ones are that the N wifi signals are ALL NAT3, which prohibits online play on most (all?) modern consoles and that to get the extra range, N sacrifices both speed and accuracy. Don't believe what you read on the boxes, the 600mbps speeds and shit are only achieved in very unlikely setups that really no one outside the NASA can achieve on a consistant basis.
The WRT54G is good and reliable, and they recently came out with the WRT54G2 which has the same architecture but with a double-coil transmitter, so it's got some more range and is generally a lot more accurate.
Also Belkin routers are infamous for not working too well with consoles in the first place, my first router was a Belkin and refused to play online on any console even wired, and I've had troubles with 3 other Belkin models including the one you use. In most case, online didn't work at all and at best it was very fiddly and prone to disconnecting me at any time for no reason.